What vitamin deficiency causes a purple tongue? Understanding Riboflavin and Other Nutritional Links
                                
                                
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                                    4 min read                                
                            
                                Approximately 1 in 4 people admitted to a hospital may have a nutritional deficiency, and sometimes the tongue can reveal these issues. A change in tongue color is one such indicator, and understanding what vitamin deficiency causes a purple tongue is a crucial first step toward addressing an underlying health concern.